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Questions and Answers
What is the purpose of the 'getcube' function in the provided code snippet?
What is the purpose of the 'getcube' function in the provided code snippet?
What is the correct way to access the value of 'uname' in the 'chkval' function?
What is the correct way to access the value of 'uname' in the 'chkval' function?
What will happen if 'upass.length' in the 'chkval' function evaluates to zero?
What will happen if 'upass.length' in the 'chkval' function evaluates to zero?
In the 'display' function, what does the 'prompt' method do in JavaScript?
In the 'display' function, what does the 'prompt' method do in JavaScript?
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What action does the 'alert' method perform in JavaScript?
What action does the 'alert' method perform in JavaScript?
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Study Notes
JavaScript Functions
- A JavaScript function is defined using the
functionkeyword, followed by the function name and parameters in parentheses. - The general syntax for a JavaScript function is:
function functionName([arg1, arg2,...argN]) { //code to be executed } - Functions can be called multiple times from different parts of a script.
Example Functions
- A simple function:
msg()displays an alert message "hello! this is message" - A function with a parameter:
getcube(number)calculates the cube of the input number and displays it in an alert message - A function with conditional logic:
chkval()checks if the username and password are valid, and displays an error message if the username is blank
JavaScript Prompt Function
- The
prompt()function is used to display a prompt box to the user, and returns the user's input as a string. - The
prompt()function is often used to get user input, such as a name or a value.
Example of Using Prompt Function
- The
display()function uses theprompt()function to get the user's name, and then displays a message with the user's name usingdocument.write().
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Description
Test your knowledge of JavaScript functions with this quiz. Identify errors in function syntax and understand how functions are used in JavaScript programming.
